Re: Performance issue of 'git branch'

From: Jakub Narebski <jnareb@gmail.com>
Date: Jul 23, 2009, 12:42 UTC
Message-ID: <m3prbr371l.fsf@localhost.localdomain>
In-Reply-To: <alpine.LFD.2.01.0907221925100.3352@localhost.localdomain>

Linus Torvalds <torvalds@linux-foundation.org> writes:

Show 17 quoted lines

> On Thu, 23 Jul 2009, Carlos R. Mafra wrote:
> > 
> > Is there another way to check what is going on with that anomalous lstat()?
> 
> I really don't think it's the lstat any more. Your directories look small 
> and simple, and clearly the indexing made no difference.
> 
> See earlier email about using "strace -T" instead of "-tt". Also, I sent 
> you a patch to try out just a minute ago, I think that may be it.
> 
> > [ perhaps I will try 'perf' after I read how to use it ]
> 
> I really like 'perf' (it does what oprofile did for me, but without the 
> headaches), but it doesn't help with IO profiling.
> 
> I've actually often wanted to have a 'strace' that shows page faults as 
> special system calls, but it's sadly nontrivial ;(

BTW. Would SystemTap help there? Among contributed scripts there is iotimes, so perhaps it would be possible to have iotrace...

-- 
Jakub Narebski
Poland
ShadeHawk on #git